Funding for this research was provided by:
National Aeronautics and Space Administration (NAG5-6999)
National Science Foundation (DEB#0080529)
National Science Foundation (DEB#0217774)
Article History
Received: 10 January 2017
Accepted: 26 September 2017
First Online: 9 October 2017
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.